You will need to see the specific error first. MyBB otherwise hides them, as you are seeing above.
To enable error displaying/logging:
Go to ACP -> Configuration -> Server & Optimization settings -> Error logging/Error_logging_medium, and enable error logging/displaying.
If this issue has occurred repeatedly with multiple plugins, it is likely an issue with incompatibilities with your MySQL configuration. Check to see if Strict Mode is enabled via your host. Although MyBB's core is well-designed for Strict Mode, many plugin developers have not developed their plugins equivalently. As a result, issues like this are very common if Strict Mode is enabled on a typical MyBB installation.
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